PROCESS FOR PRODUCING THIOUREA DIOXIDE AND BLEACHING OF PAPERMAKING PULP WITH THIOUREA DIOXIDE PRODUCED THEREBY

摘要

An economical process for producing thiourea dioxide fluid with reduced chemical loss and energy consumption by mixing a combination of thiourea and a peroxide, a combination of thiourea, a peroxide and a reaction catalyst, or a combination of thiourea, a peroxide, a reaction catalyst and a chelating agent in the optional presence of pulp; and a method of bleaching pulp with the thiourea dioxide fluid thus produced.